TITLE: GCN CIRCULAR
NUMBER: 23192
SUBJECT: GRB 180829A: Swift-XRT observations
DATE: 18/08/30 08:10:55 GMT
FROM: Phil Evans at U of Leicester
J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A.P. Beardmore
(U. Leicester), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), P.
D'Avanzo (INAF-OAB), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU),
D.N. Burrows (PSU) and P.A. Evans (U. Leicester) report on behalf of
the Swift-XRT team:
Swift-XRT has performed follow-up observations of the MAXI-detected
burst GRB 180829A (Yamada et al. GCN Circ. 23186) in a series of
observations tiled on the sky. The total exposure time is 1.4 ks,
distributed over 7 tiles; the maximum exposure at a single sky location
was 420 s. The data were collected between T0+56.4 ks and T0+57.9 ks,
and are entirely in Photon Counting (PC) mode.
No X-ray sources have been detected. The 3-sigma upper limit in the
field (not including the regions where the tiles overlap) ranges from
~0.03 to ~0.11 ct s^-1, corresponding to a 0.3-10 keV observed flux of
1.1e-12 to 4.4e-12 erg cm^-2 s^-1 (assuming a typical GRB spectrum).
The results of the XRT-team automatic analysis of the tiled XRT
observations, including a position-specific upper limit calculator, are
available at http://www.swift.ac.uk/xrt_products/TILED_GRB00073.
This circular is an official product of the Swift-XRT team.